Ubuntu，暴發戶，並創建一個監控pid

Question

以下是redis的新貴腳本。如何創建一個pid，因此我使用monit進行監控？

#!upstart 
description "Redis Server" 

env USER=redis 

start on startup 
stop on shutdown 

respawn 

exec sudo -u $USER sh -c "/usr/local/bin/redis-server /etc/redis/redis.conf 2>&1 >> /var/log/redis/redis.log" 

Answer 1

如果您的計算機上有可用的start-stop-daemon，我強烈建議使用它來啓動您的進程。 start-stop-daemon會以非特權用戶的身份啓動進程，而不會從sudo或su（recommended in the upstart cookbook）分叉，並且它還內置了對pid文件管理的支持。例如：

/etc/init/app_name.conf

#!upstart 
description "Redis Server" 

env USER=redis 

start on startup 
stop on shutdown 

respawn 

exec start-stop-daemon --start --make-pidfile --pidfile /var/run/app_name.pid --chuid $USER --exec /usr/local/bin/redis-server /etc/redis/redis.conf >> /var/log/redis/redis.log 2>&1 

另外，您可以手動使用post-start script節創建它並post-stop script節刪除它管理的pid文件。例如：

/etc/init/app_name.conf

#!upstart 
description "Redis Server" 

env USER=redis 

start on startup 
stop on shutdown 

respawn 

exec sudo -u $USER sh -c "/usr/local/bin/redis-server /etc/redis/redis.conf 2>&1 >> /var/log/redis/redis.log" 

post-start script 
    PID=`status app_name | egrep -oi '([0-9]+)$' | head -n1` 
    echo $PID > /var/run/app_name.pid 
end script 

post-stop script 
    rm -f /var/run/app_name.pid 
end script 

Answer 2

雞蛋的啓停守護一號例子是路要走。

如果您選擇2nd，我會建議$$獲取PID。

#!upstart 
description "Redis Server" 

env USER=redis 

start on startup 
stop on shutdown 

respawn 

script 
    echo $$ > /var/run/app_name.pid 
    exec sudo -u $USER sh -c "/usr/local/bin/redis-server /etc/redis/redis.conf 2>&1 >> /var/log/redis/redis.log" 
end script 

post-stop script 
    rm -f /var/run/app_name.pid 
end script